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- W2044988664 abstract "A two-dimensional Debye cluster is a system of n identical particles confined in a parabolic well and interacting through a screened Coulomb (i.e., a Debye-Hückel or Yukawa) potential with a Debye length λ. Experiments were performed for 27 clusters with n=3–63 particles (9μmdiam) in a capacitively coupled 9 W rf discharge at a neutral argon pressure of 13.6mTorr. In the strong-coupling regime each particle exhibits small amplitude Brownian motion about its equilibrium position. These motions were projected onto the center-of-mass and breathing modes and Fourier analyzed to give resonance curves from which the mode frequencies, amplitudes, and damping rates were determined. The ratio of the breathing frequency to the center-of-mass frequency was compared with theory to self-consistently determine the Debye shielding parameter κ, Debye length λ, particle charge q, and mode temperatures. It is found that 1≲κ≲2, and κ decreases weakly with n. The particle charge averaged over all measurements is −14200±200e, and q decreases slightly with n. The two center-of-mass modes and the breathing mode are found to have the same temperature, indicating that the clusters are in thermal equilibrium with the neutral gas. The average cluster temperature is 399±5K." @default.
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- W2044988664 date "2006-06-01" @default.
- W2044988664 modified "2023-10-10" @default.
- W2044988664 title "Study of two-dimensional Debye clusters using Brownian motion" @default.
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- W2044988664 doi "https://doi.org/10.1063/1.2215475" @default.
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